Ever wonder how often you fool your boss or in-laws by pretending to laugh at their dumb jokes? The answer is probably around one-third of the time, according to new research by a communication expert who conducted research on fake laughs. When your fake laughs fall short of convincing, tiny subtleties of your breathing are probably giving you away, suggests one researcher.

Source: 'Laughter Guy' dissects features of counterfeit chortling